CN218633468U - Straight strip type stator punching sheet, stator and motor - Google Patents

Abstract

The utility model provides a straight bar type stator punching sheet, a stator and a motor, wherein the straight bar type stator punching sheet is arranged in the arranging production process to produce a plurality of stator punching sheet units, and the plurality of stator punching sheet units comprise a first stator punching sheet unit and a second stator punching sheet unit; one end of the first stator tooth is connected to the first stator yoke part, the other end of the first stator tooth extends towards the direction departing from the second stator punching unit, one end of the second stator tooth is connected to the second stator yoke part, the other end of the second stator tooth extends towards the direction departing from the first stator punching unit, and the first stator yoke part and the second stator yoke part are connected; the end face, opposite to the first stator tooth, of the first stator yoke is a second end face; the end surface of the second stator yoke part, which is opposite to the second stator teeth, is a fourth end surface; the second end face and the fourth end face are matched and are mutually attached. According to the utility model discloses can effectively save the scrap (bridge bf 2) between the original every group stator punching sheet, improve the utilization ratio to the material, reduce the stator cost.

Description

Straight strip type stator punching sheet, stator and motor

Technical Field

The utility model relates to the technical field of electric machines, concretely relates to straight strip type stator is towards piece, stator and motor.

Background

Cost reduction is one of important targets of motor research and development, the electromagnetic technology in the field of the existing fan motor is mature, the homogeneity of products of various manufacturers is serious, and the purpose of cost reduction is difficult to achieve from optimization of an electromagnetic scheme, so that the improvement of the material utilization rate of the motor by reducing production process waste becomes a main cost reduction route.

The prior art stator forms generally fall into 4 categories: round, block, coil, straight strip. The material utilization rate of the round stator is low, and the winding speed is low; each stator unit of the segmented stator needs to be wound independently, the number of wire ends processed after splicing is large, the working procedures are multiple and complex, and the rounding precision is low; the structure of the coiled stator is complex, and the process difficulty is high; the straight bar type stator has comprehensive advantages in all aspects, so the straight bar type stator is most widely applied to fan motors.

As shown in fig. 1, a conventional stator core is generally in an opposite-insertion type, that is, two rows of stator punching teeth are alternately inserted into one group and are simultaneously punched. According to the shape of a traditional stator iron core, two lapping edges are required to be reserved during stock layout, one of the two lapping edges is reserved between two rows of stator punching sheets in one group, the width of the lapping edge is bf1, the other lapping edge is reserved between two groups, the width of the lapping edge is bf2, and the material utilization rate of one row of stator punching sheets

The stator punching sheet has the advantages that the number of the teeth is not larger than = V1 x 2/L1/(b 1+ hj1+ bf1+ bf 2), the number of the teeth is not larger than 1, the number of the teeth is not smaller than 1, L1 is not larger than 6-9 mm, V1 is the practical area of a traditional stator punching sheet, b1 is the width of the stator punching sheet, L1 is the width of a stock layout, Z1 is the number of teeth of a stator core, L4 is the tooth pitch, and hj1 is the height of a yoke portion, so that the material utilization rate of the stator punching sheet can be greatly improved by eliminating lapping edges and shortening the tooth pitch of the stator core.

Because stator among the prior art need reserve the scrap (bridge) and lead to having material utilization rate low grade technical problem when punching the stock layout, consequently the utility model discloses research and design out a vertical bar formula stator punching, stator and motor.

SUMMERY OF THE UTILITY MODEL

Therefore, the to-be-solved technical problem of the utility model lies in overcoming the stator among the prior art and need reserve the scrap (bridge) and lead to having the defect that material utilization is low when going to the sheet stock layout to a straight strip stator is towards piece, stator and motor are provided.

In order to solve the above problem, the utility model provides a straight strip type stator punching sheet, it includes:

the straight strip type stator punching sheet is arranged in a layout manufacturing process to manufacture a plurality of stator punching sheet units, the structures of the plurality of stator punching sheet units are the same, and the plurality of stator punching sheet units comprise a first stator punching sheet unit and a second stator punching sheet unit;

the first stator punching unit comprises a first stator tooth and a first stator yoke, one end of the first stator tooth is connected to the first stator yoke, the other end of the first stator tooth extends towards the direction departing from the second stator punching unit, the second stator punching unit comprises a second stator tooth and a second stator yoke, one end of the second stator tooth is connected to the second stator yoke, the other end of the second stator tooth extends towards the direction departing from the first stator punching unit, and the first stator yoke is connected with the second stator yoke;

the end face, provided with the first stator teeth, of the first stator yoke part is a first end face, and the end face opposite to the first stator teeth is a second end face; the end face, provided with the second stator teeth, of the second stator yoke is a third end face, and the end face opposite to the second stator teeth is a fourth end face; the second end face and the fourth end face are matched and are mutually attached;

the first stator punching units are connected in sequence to form the straight bar type stator punching, and the first stator punching unit at the head end is connected with the first stator punching unit at the tail end to form an annular stator punching structure;

the first stator yoke is provided with a yoke inner surface boss outwards and convexly arranged on the first end surface, and the height of the yoke inner surface boss from the first end surface is the yoke inner surface boss height h2;

the joint of the inner surface bosses of the yoke parts of the two adjacent first stator yoke parts is provided with a connecting groove, and the groove top of the connecting groove is also provided with a sinking groove to form a first process groove.

In some embodiments, the stator punching device further comprises a third stator punching unit, wherein the third stator punching unit, the first stator punching unit and the second stator punching unit are sequentially connected;

the third stator punching unit comprises a third stator tooth and a third stator yoke, one end of the third stator tooth is connected to the third stator yoke, the other end of the third stator tooth extends towards the first stator yoke and is connected with the first stator yoke; the first stator teeth extend towards the third stator yoke part and are arranged in a connection mode with the third stator yoke part;

the end face of the third stator yoke portion, on which the third stator teeth are arranged, is a fifth end face, and the end face opposite to the third stator teeth is a sixth end face; the free end face of the first stator tooth is matched with the fifth end face and is mutually attached, and the free end face of the third stator tooth is matched with the first end face and is mutually attached.

In some embodiments, the number of the second stator punching units is multiple, and the second stator punching units are connected in sequence; the number of the third stator punching units is multiple, and the multiple third stator punching units are sequentially connected; the first stator teeth are inserted between two adjacent third stator teeth, and the third stator teeth are inserted between two adjacent first stator teeth to form a plug-in type layout structure.

In some embodiments, a free end face of the first stator tooth is a first arc face, the fifth end face of the third stator yoke is a second arc face, and the first arc face is in abutting contact with the second arc face; the free end face of the third stator tooth is a third cambered surface, the first end face of the first stator yoke is a fourth cambered surface, and the third cambered surface is attached to the fourth cambered surface.

In some embodiments, the first arc surface is a concave arc surface and the second arc surface is a convex arc surface; the third cambered surface is a concave cambered surface, and the fourth cambered surface is a convex cambered surface.

In some embodiments, the second end face of the first stator yoke is a straight plane and the fourth end face of the second stator yoke is a straight plane at the time of stock layout.

In some embodiments, the connection slot is opposite the second end face and the minimum distance between the connection slot and the second end face is a yoke connection height h1; the width of the first process groove is b3, the distance between the joint position of the first end surface and the inner surface boss of the yoke part and the second end surface is the yoke part height hj2, the tooth number of the first stator tooth is the tooth number Z1 of the stator core, and the parameters satisfy the following relational expression: b3=2 × (hj 2-h1+ h 2) × tan (180 °/Z1) + (0.2-0.5) mm.

In some embodiments, a second process groove is arranged on the free end surface of the first stator tooth, and the depth t1 of the second process groove is = 0.2-0.3 mm; the first end face with the position of meeting of yoke portion internal surface boss is provided with the technology chamfer, just h2 is greater than the radius of technology chamfer.

In some embodiments, a tooth pitch between two adjacent first stator punching sheet units is L3, L3 is a distance between center lines of two adjacent first stator teeth, a distance between the second end surface and a circle center along a radial direction in the annular stator punching sheet structure is a stator radius R, a number of teeth of the first stator teeth is a stator core tooth number Z1, and the following relationship is satisfied by the above parameters: l3=2 (R-h 1-t 3) tan (180 °/Z1).

In some embodiments, the layout width of the straight bar type stator punching sheet is L2, L2 is a plurality of the lengths of the first stator punching sheet units connected in sequence, the number of teeth of the first stator teeth is Z1, the tooth pitch between two adjacent first stator punching sheet units is L3, L3 is the distance between the central lines of two adjacent first stator teeth, and the following relations are satisfied by the above parameters: l2= (Z1 + 0.5) × L3+ (6-9 mm).

In some embodiments, a first protrusion is convexly arranged on the first stator yoke portion of the first stator punching unit at the head end toward the first stator yoke portion of the first stator punching sheet at the tail end, a first groove is arranged on the first stator yoke portion of the first stator punching unit at the tail end toward the direction away from the first stator yoke portion of the first stator punching sheet at the head end, and the first protrusion can be inserted into the first groove to form a clamping connection.

In some embodiments, the first protrusion is an arc protrusion, the first groove is an arc groove, the width of the arc protrusion in a direction perpendicular to the first end surface is b4, the distance between the first end surface and the second end surface of the first stator yoke portion is a yoke height hj2, the number of teeth of the first stator tooth is a stator core tooth number Z1, and the following relationship is satisfied: b4= (20% to 40%) (hj 2+ h 2)/tan (180 °/Z1).

In some embodiments, a second protrusion is convexly arranged on the second end surface of the first stator yoke of the first stator punching unit at the head end in a direction away from the first end surface, a third protrusion is convexly arranged on the second end surface of the first stator yoke of the first stator punching unit at the tail end in a direction away from the first end surface, a position where the first protrusion is connected with the first groove is between the first end surface and the first protrusion, and a surface where the two first stator yokes are opposite and connected is a first connecting surface; a side surface of the second protrusion is joined to a side surface of the third protrusion to form a second joining surface, the second joining surface and the first joining surface are located on different surfaces, the second joining surface is located closer to the first stator tooth at the head end relative to the first joining surface, the second protrusion is a pointed protrusion, and the third protrusion is a protrusion smoothly formed on the second end surface; the first process trench is located radially inward of the first interface surface.

In some embodiments, the first contact surface and the second contact surface both pass through the center of the ring-shaped stator lamination structure, and a center-included angle formed by the first contact surface and the second contact surface is a; the protruding height of the second protrusion is the same as that of the third protrusion, and is h3, and

h3= 0.2-0.5 mm = R/cos (a +180 °/Z1) -R/cos (180 °/Z1), wherein R is the distance between the second end face and the center of the circle, namely the radius of the stator.

In some embodiments, the first stator tooth includes a stator tooth body and pole shoes, one end of each pole shoe is connected to a circumferential side of the stator tooth body and is farthest away from the first stator yoke portion, and the other end of each pole shoe extends in the circumferential direction, and the two pole shoes are arranged in one-to-one correspondence with two circumferential sides of the stator tooth body;

the protrusion is provided with first knot point on the terminal surface of stator tooth main part, the both sides of first knot point all are provided with the preformed groove, the degree of depth of preformed groove is t2, the protrusion is provided with the second knot point on the terminal surface of first stator yoke portion.

In some embodiments, the stator tooth body has a circumferential width bt and satisfies the relationship: t2= (1% -2%) btt/2.

In some embodiments, after forming the annular stator lamination structure, the first stator tooth is located radially inside the first stator yoke portion, i.e., the stator core for the inner rotor motor.

The utility model also provides a stator, it includes preceding arbitrary straight strip stator towards the piece.

The utility model also provides a motor, it includes aforementioned stator.

The utility model provides a pair of straight strip type stator punching sheet, stator and motor have following beneficial effect:

1. the utility model discloses a with a plurality of stator punching sheet units of straight strip stator punching sheet in the stock layout preparation process all the same, and the first stator yoke portion of first stator punching sheet unit and the laminating design of the second stator yoke portion of second stator punching sheet unit, and the second terminal surface of first stator yoke portion and the fourth terminal surface of second stator yoke portion mutual adaptation and laminate mutually, can effectively save the overlap bf2 between the original every group stator punching sheet, save this part overlap structure, make the relative terminal surface adaptation of two sets of stator yoke portions and laminate mutually, can improve the utilization ratio to the material effectively, the yoke portion surface of preferred straight strip stator punching sheet is a straight face promptly, during the stock layout, need not to reserve the overlap between every group stator punching sheet, improve the material utilization ratio, reduce the stator cost; the utility model discloses still through mutually supporting and laminating the free end terminal surface of the first stator tooth of first stator punching unit and the fifth end of the third stator yoke portion of third stator punching unit, the free end terminal surface of third stator tooth and the first end of first stator yoke portion mutually support and laminate, can effectively save the overlap bf1 that reserves between two rows of stator punching sheets in original a set of, can further improve the utilization ratio to the material, promptly the utility model discloses the interior diametral plane of straight strip formula stator punching sheet is laminating with the yoke portion internal surface and is arranging the appearance, need not to reserve the overlap between two rows of stator punching sheets, improves material utilization ratio, reduces stator cost; the utility model discloses still be equipped with first technology groove through stator punching sheet inner diameter face and yoke portion junction, namely spread groove top department is equipped with first technology groove, can the stamping process, makes machine oil better permeate in the punching sheet material, prevents cutter and punching sheet damage, has solved the stator punching sheet and has leaded to the problem of cutter and punching sheet damage easily when punching press; the first process groove can prevent the stator punching sheet from leaving slender excess materials at the punched rear corner, avoids secondary processing and solves the problem that the stator punching sheet needs secondary processing because excess materials are left at the punched rear corner; the process groove also has weakening effect on the cogging torque and the torque ripple of the motor, and solves the problems of large cogging torque and large torque ripple of the motor; namely, the utility model can effectively weaken the torque of the tooth socket and the torque pulsation through the process groove at the joint of the yoke part and can also effectively prevent the problem of magnetic flux saturation;

2. the utility model discloses further first technology groove width satisfies the relational expression:

b3=2 (hj 2-h1+ h 2) tan (180 °/Z1) + (0.2-0.5) mm, and the depth t1= 0.1-0.3 mm of the second process groove on the inner diameter surface can effectively weaken the cogging torque and the torque pulsation of the motor and avoid secondary processing;

3. the utility model discloses a strip stator core both sides overlap joint department is equipped with assorted circular arc arch and circular arc recess respectively, can effectively avoid strip stator core to become the phenomenon of fracture (the breach of current structure is a straight line, the welding atress is easy to split; the utility model discloses through protruding and recess cooperation and form the skew angle in the punching press process, so the breach is not a straight line, so difficult to split), can effectively guarantee stator core's rounding precision, solve the stator core and become the problem that the easy fracture of back and lead to the stator circularity is low after the circle;

4. the utility model discloses a stator core becomes the circle after, has convex structure outside the lap mouth, this is favorable to welding process, and welding process has only one step, and production efficiency is high, has solved stator core and has become the circle after welding process more, problem that production efficiency is lower; the reserved grooves are formed in two sides of the buckling point position of the tooth part of the stator punching sheet, so that the tooth width size does not exceed the tolerance range after the buckling point is punched, the product percent of pass is improved, and the problem that the tooth width size of the stator is increased after the buckling point is punched by the stator punching sheet is solved;

5. the utility model discloses a stator core tooth portion is inboard in yoke portion, and inner rotor motor stator core is used promptly, and straight strip formula stator core becomes the circle after, guarantees that the notch width can not be too big, improves the performance of motor, has solved stator core and has become the circle after, and the notch width is too big, leads to the problem of motor performance reduction.

Drawings

Fig. 1 is a layout structure view of a conventional straight bar type stator core;

fig. 2 is a layout structure diagram of the straight bar type stator core of the present invention;

FIG. 2a is a partial enlarged view of the portion O in FIG. 2;

fig. 3 is a round structure diagram of the straight bar type stator core of the present invention;

fig. 4 is a partially enlarged view of the straight bar type stator core of the present invention;

FIG. 4a is an enlarged partial view of the yoke joint (at A) of FIG. 4;

FIG. 4b is an enlarged partial view of the yoke joint (at E) of FIG. 4;

fig. 5 is a partially enlarged view of the straight bar type stator core of the present invention at the lap joint;

FIG. 5a is an enlarged view of a portion of the lap (at B) of FIG. 5;

fig. 6 is a structural diagram of connection of two stator punching units when a conventional straight bar type stator core has no process slot and no yoke boss;

fig. 6a is a partially enlarged view of the portion C of fig. 6;

fig. 6b is a partially enlarged view of a portion D of fig. 6.

The reference numerals are represented as:

101. a first stator punching unit; 102. a second stator lamination unit; 1. a first stator tooth; 2. a first stator yoke; 21. a first end face; 22. a second end face; 3. a second stator tooth; 4. a second stator yoke; 41. a third end face; 42. a fourth end face; 103. a third stator punching unit; 5. a third stator tooth; 6. a third stator yoke; 61. a fifth end face; 62. a sixth end face; 7. a first process tank; 8. a boss on the inner surface of the yoke part; 9. connecting grooves; 10. a second process tank; 11. a first protrusion; 12. a first groove; 13. a second protrusion; 14. a third protrusion; 15. a first junction surface; 16. a second interface surface; 17. a stator tooth body; 18. a pole shoe; 191. a first fastening point; 192. a second fastening point; 20. reserving a groove; 20a, elongated remnants.

Detailed Description

As shown in fig. 2-5, the utility model provides a straight strip type stator punching sheet, it includes:

the straight strip type stator punching sheet is used for simultaneously performing stock layout manufacturing on a plurality of stator punching sheet units in the stock layout manufacturing process, the structures of the plurality of stator punching sheet units are the same, and the plurality of stator punching sheet units comprise a first stator punching sheet unit 101 and a second stator punching sheet unit 102;

the first stator punching unit 101 comprises a first stator tooth 1 and a first stator yoke 2, one end of the first stator tooth 1 is connected to the first stator yoke 2, the other end of the first stator tooth extends towards the direction departing from the second stator punching unit 102, the second stator punching unit 102 comprises a second stator tooth 3 and a second stator yoke 4, one end of the second stator tooth 3 is connected to the second stator yoke 4, the other end of the second stator tooth extends towards the direction departing from the first stator punching unit 101, and the first stator yoke 2 is connected with the second stator yoke 4;

the end face of the first stator yoke 2, on which the first stator tooth 1 is arranged, is a first end face 21, and the end face opposite to the first stator tooth 1 is a second end face 22; the end surface of the second stator yoke 4, on which the second stator teeth 3 are arranged, is a third end surface 41, and the end surface opposite to the second stator teeth 3 is a fourth end surface 42; the second end surface 22 and the fourth end surface 42 are matched and are mutually attached;

the number of the first stator punching units 101 is multiple, the multiple first stator punching units are sequentially connected to form the straight bar type stator punching, and the first stator punching unit at the head end is connected with the first stator punching unit at the tail end to form an annular stator punching structure;

the first stator yoke 2 is provided with a yoke inner surface boss 8 protruding outwards on the first end surface 21, and the height of the yoke inner surface boss 8 from the first end surface 21 is a yoke inner surface boss height h2;

the inner yoke surface bosses 8 of two adjacent first stator yokes 2 are provided with connecting grooves 9 at the joint, and sunken grooves are further arranged at the groove tops of the connecting grooves 9 to form the first process grooves 7.

The utility model discloses a with straight strip stator towards a plurality of stator towards the piece unit homonymies of piece in the stock layout manufacturing process, and the first stator yoke portion of first stator punching piece unit and the second stator yoke portion laminating design of second stator towards the piece unit, and the second terminal surface of first stator yoke portion and the mutual adaptation of the fourth terminal surface of second stator yoke portion and laminate mutually, can effectively save the border bf2 of taking between the original every group stator towards the piece, save this part border structure, make the relative terminal surface adaptation of two sets of stator yoke portions and laminate each other, can improve the utilization ratio to the material effectively, it is a straight face to prefer the yoke portion surface of straight strip stator towards the piece promptly, during the stock layout, need not to reserve the border between every group stator towards the piece, improve the material utilization ratio, reduce the stator cost. The utility model discloses still be equipped with first technology groove through stator punching sheet inner diameter face and yoke portion junction, namely spread groove top department is equipped with first technology groove, can the stamping process, makes machine oil better permeate in the punching sheet material, prevents cutter and punching sheet damage, has solved the stator punching sheet and has leaded to the problem of cutter and punching sheet damage easily when punching press; the process groove can prevent the stator punching sheet from leaving slender excess materials at the punched rear corner, avoids secondary processing and solves the problem that the stator punching sheet needs secondary processing because the excess materials are left at the punched rear corner; the process groove also has weakening effect on the cogging torque and the torque ripple of the motor, and solves the problems of large cogging torque and large torque ripple of the motor; namely, the utility model can effectively weaken the torque and the torque pulsation of the tooth socket through the process groove at the joint of the yoke part and can also effectively prevent the problem of magnetic flux saturation; the utility model discloses a straight bar stator meets in order to form annular stator lamination structure through a plurality of first stator lamination unit first to press a plurality of annular stator lamination structure superposes into stator core structure as an organic whole.

The utility model discloses a utility model is little:

1. the outer surface of the yoke part of each straight strip type stator punching sheet is a straight surface, each group of stator punching sheets can be attached to perform layout, no overlap edge needs to be reserved between the stator punching sheets, and the material utilization rate is improved; the inner diameter surface of the straight strip type stator punching sheet and the inner surface of the yoke part can be attached to carry out opposite insertion and layout, no overlap edge needs to be reserved between two rows of stator punching sheets, and the material utilization rate is improved;

2. the joint of the inner diameter surface and the yoke part of the stator punching sheet is provided with a first process groove, and the width of the first process groove satisfies the relation: b3=2 (hj 2-h1+ h 2) tan (180 °/Z1) + (0.2-0.5) mm, and the depth t1= 0.1-0.3 mm of the second process groove on the inner diameter surface can effectively weaken the cogging torque and the torque pulsation of the motor and avoid secondary processing;

3. a boss is designed on the inner surface of the yoke part, the height h2 of the boss needs to be larger than the radius of a process chamfer, the chamfer is left on the boss, and long and thin excess materials are prevented from being left on two sides of a pole shoe after the stator punching sheet is punched, so that secondary processing is avoided;

4. the lap openings on the two sides of the straight bar type stator core are respectively provided with a circular arc protrusion and a circular arc groove which are matched, and the width of the circular arc protrusion satisfies the relational expression: b4= (20% -40%) (hj 2+ h 2)/tan (180 °/Z1), and the phenomenon of cracking after the straight bar type stator iron core is rounded can be effectively avoided;

5. partial yoke portion of the protruding top of circular arc offsets toward the bellied opposite direction of circular arc, and partial yoke portion of circular arc recess top offsets toward the notch scheme of circular arc recess, and two skew angles are unanimous, and the yoke portion of circular arc recess top has the outer protruding structure of taking a mouthful after the skew, and the design closed angle of yoke portion of the protruding top of circular arc is protruding, makes this partial yoke portion also have the outer protruding structure of taking a mouthful, and two protruding structure highly uniform, and skew angle an and protrusion height h3 satisfy the relational expression: h3= 0.2-0.5mm = R/cos (a +180 °/Z1) -R/cos (180 °/Z1), and the joint external convex structure is beneficial to the welding process;

6. stator punching tooth portion detains some position both sides and is equipped with the preformed groove, and the preformed groove degree of depth satisfies the relational expression:

t2= (1% -2%) bt/2, and the tooth width size can be guaranteed not to exceed the tolerance range after the point is stamped.

The utility model provides a following technical problem:

1. the problem of low material utilization rate caused by the need of reserving the lap during the stock layout of the stator punching sheet is solved;

2. the problem that a cutter and a punching sheet are easily damaged when the stator punching sheet is punched is solved;

3. the problem that the angle part of the punched stator punching sheet is provided with excess materials and needs secondary processing is solved;

4. the problems of large cogging torque and large torque pulsation of the motor are solved;

5. the problem of low roundness of the stator caused by easy cracking of the round stator core is solved;

6. the problems that the welding process is more and the production efficiency is lower after the stator core is rounded are solved;

7. the problem that the tooth width of the stator is increased after the stator punching sheet is punched to form a fastening point is solved;

8. the problem of stator core become the circle after, the notch width is too big, leads to motor performance to reduce is solved.

Problem to technical background, the utility model provides a no scrap (bridge) straight bar formula stator core of high material utilization, high rounding precision, concrete technical scheme is as follows:

1. the utility model discloses the straight bar stator core that does not have scrap (bridge) is folded by a plurality of stator punching and is pressed and form, every the stator punching includes a plurality of stator unit that connect gradually, each the stator unit includes yoke portion, tooth portion and pole shoe.

2. As shown in fig. 2, the inner diameter surface of the straight-bar stator punching sheet and the inner surface of the yoke portion can be attached to perform opposite insertion and layout, and no overlap is required to be reserved between two rows of stator punching sheets; the outer surface of the yoke part of the straight strip type stator punching sheet is a straight surface, each group of stator punching sheets can be attached to perform sample arrangement, no overlap edge needs to be reserved between the stator punching sheets, the sample arrangement length can be greatly shortened by eliminating two overlap edges, and the material utilization rate of the stator punching sheets is improved.

In some embodiments, the stator punching device further comprises a third stator punching unit 103, and the third stator punching unit 103, the first stator punching unit 101 and the second stator punching unit 102 are sequentially connected;

the third stator punching unit 103 comprises a third stator tooth 5 and a third stator yoke 6, one end of the third stator tooth 5 is connected to the third stator yoke 6, and the other end of the third stator tooth extends towards the first stator yoke 2 and is connected with the first stator yoke 2; the first stator tooth 1 protrudes in the direction of the third stator yoke 6 and is arranged in contact with the third stator yoke 6;

the end surface of the third stator yoke 6 on which the third stator teeth 5 are arranged is a fifth end surface 61, and the end surface opposite to the third stator teeth 5 is a sixth end surface 62; the free end face of the first stator tooth 1 is matched with the fifth end face 61 and attached to the fifth end face, and the free end face of the third stator tooth 5 is matched with the first end face 21 and attached to the first end face.

The utility model discloses still through the free end terminal surface of the first stator tooth with first stator punching unit and the mutual adaptation and laminating of fifth end of the third stator yoke portion of third stator punching unit, the free end terminal surface of third stator tooth and the mutual adaptation and laminating of first end of first stator yoke portion can effectively save two rows of original stator in a set of and carry out the layout towards the scrap (bridge) bf1 of reserving between the piece, can further improve the utilization ratio to the material, promptly the utility model discloses straight strip formula stator is being laminated with yoke portion internal surface towards the inside diameter face of piece and is carrying out the layout, need not to reserve the scrap (bridge) between two rows of stator towards the piece, further improves material utilization ratio, further reduces stator cost.

In some embodiments, the number of the second stator punching units 102 is multiple, and the multiple second stator punching units are connected in sequence; the number of the third stator punching units 103 is multiple, and the multiple third stator punching units are sequentially connected; the first stator teeth 1 are inserted between two adjacent third stator teeth 5, and the third stator teeth 5 are inserted between two adjacent first stator teeth 1 to form a plug-in sample arrangement structure. This is the utility model discloses a second stator is towards preferred structural style of piece unit and third stator towards piece unit, can produce a plurality of stators towards piece unit simultaneously promptly in one row's stock layout, form annular stator towards can be through pressing into the stator core structure behind the piece structure, owing to effectively saved two rows of stators in a set of towards the first scrap (bf 1) of reserving between the piece and every group stator towards the second scrap (bf 2) between the piece, consequently just can effectively improve the utilization ratio to the material, the cost of stator has been reduced.

In some embodiments, the free end surface of the first stator tooth 1 is a first arc surface, the fifth end surface 61 of the third stator yoke 6 is a second arc surface, and the first arc surface and the second arc surface are in abutting joint; the end surface of the free end of the third stator tooth 5 is a third cambered surface, the first end surface 21 of the first stator yoke 2 is a fourth cambered surface, and the third cambered surface is attached to the fourth cambered surface;

the second end surface 22 of the first stator yoke 2 is a straight plane and the fourth end surface 42 of the second stator yoke 4 is a straight plane in the pattern production.

This is the utility model discloses a free end terminal surface of first stator tooth and the preferred structural style of fifth terminal surface form the cooperation of cambered surface promptly through the structure of cambered surface, can form the plane laminating through straight plane, and original scrap (bridge) is saved effectively to the homoenergetic, save material, improves material utilization, reduces the cost of stator.

In some embodiments, the first arc surface is a concave arc surface and the second arc surface is a convex arc surface; the third cambered surface is a concave cambered surface, and the fourth cambered surface is a convex cambered surface. This is the utility model discloses a preferred structural style of first cambered surface, second cambered surface, third cambered surface and fourth cambered surface can form unsmooth complex cambered surface structure.

In some embodiments, the connection slot 9 is opposite the second end face 22 and the minimum distance between the connection slot and the second end face 22 is a yoke connection height h1; the width of the first process groove 7 is b3, the distance between the connecting position of the first end surface 21 and the yoke inner surface boss 8 and the second end surface 22 is a yoke height hj2, the number of teeth of the first stator tooth 1 is a stator core tooth number Z1, and the parameters satisfy the following relational expression: b3=2 × (hj 2-h1+ h 2) × tan (180 °/Z1) + (0.2-0.5) mm.

As shown in fig. 4, a first process groove is arranged at a joint of an inner diameter surface and a yoke portion of the stator punching sheet, and a width of the first process groove satisfies a relation: b3=2 × (hj 2-h1+ h 2) × (180 °/Z1) + (0.2-0.5) mm, and the depth of the process groove is partly on the inner diameter surface, and the other part is on the yoke joint, and the depth t1= 0.1-0.3 mm of the second process groove on the inner diameter surface. The process groove can effectively weaken the cogging torque and the torque ripple of the motor; the process groove in the punching process enables engine oil to better permeate into a punching sheet material, so that the lubricating and buffering effects are increased, and the damage to a cutter and a punching sheet is prevented; as shown in FIG. 6, the process groove can prevent slender excess materials from remaining on the joint of the yoke part, and secondary processing is avoided.

In some embodiments, the depth t1=0.2 to 0.3mm of the second process groove; and a process chamfer is arranged at the joint position of the first end surface and the boss 8 on the inner surface of the yoke part, and h2 is larger than the radius of the process chamfer. As shown in fig. 4, the inner surface of the yoke part of the stator punching sheet is provided with a boss, the height h2 of the boss needs to be larger than the radius of the process chamfer, and the chamfer is left on the boss, as shown in fig. 6, the boss can prevent the two sides of the pole shoe from leaving slender excess materials after the stator punching sheet is punched, so that secondary processing is avoided.

In some embodiments, a tooth pitch between two adjacent first stator lamination units 101 is L3, L3 is a distance between center lines of two adjacent first stator teeth 1, a radial direction is along the annular stator lamination structure, a distance between the second end surface 22 and a circle center of the annular stator lamination structure is a stator radius R, a number of teeth of the first stator teeth 1 is a stator core tooth number Z1, and the following relationship is satisfied by the above parameters: l3=2 (R-h 1) tan (180 °/Z1).

The utility model discloses a tooth pitch of adjacent stator unit satisfies the relational expression:

l3=2 (R-h 1-t 3) tan (180 °/Z1), the smaller the pitch, i.e., the shorter the length of the straight bar-type stator punching sheet, the shorter the sample width L2, thereby shortening the sample width of the stator punching sheet and improving the material utilization rate.

In some embodiments, the layout width of the straight bar type stator punching sheet is L2, L2 is a length that the first stator punching sheet units 101 are sequentially connected, the number of teeth of the first stator teeth 1 is a stator core tooth number Z1, a tooth pitch between two adjacent first stator punching sheet units 101 is L3, L3 is a distance between central lines of two adjacent first stator teeth 1, and the above parameters satisfy the following relations:

L2＝(Z1+0.5)*L3+(6～9mm)；

as shown in fig. 2, the pitch of the adjacent stator units satisfies the relation:

l3=2 (R-h 1) tan (180 °/Z1), and the sample width of the straight strip stator punching sheet meets the relation:

l2= (Z1 + 0.5) × L3+ (6-9 mm), R is the outer radius of the stator core, and Z1 is the number of teeth of the stator core. The inner diameter surface of the straight stator punching sheet and the inner surface of the yoke part can be attached to carry out opposite insertion and layout, and no overlap edge is required to be reserved between two rows of stator punching sheets; the outer surface of a yoke part of the straight stator punching sheet is a straight surface, each group of stator punching sheets can be laminated to perform layout, no overlap edge needs to be reserved between the stator punching sheets, two overlap edges are eliminated, the layout material length can be greatly shortened, the stator punching sheet material utilization rate is improved, the material utilization rate of one row of stator punching sheets = V2 x 2/L2/(b 2+ hj2+ h 2), and V2 is the practical area of the stator punching sheets.

The material utilization of stator punching in the stock layout region is eta, and the practical area of stator punching in the stock layout region is V2, along the central line direction of first stator tooth 1, first stator yoke 2 second terminal surface 22 with the maximum distance between the free end face of first stator tooth 1 is stator core's width b2, first stator yoke 2 first terminal surface 21 extremely distance between the second terminal surface 22 is yoke height hj2, and above-mentioned parameter satisfies the following relational expression: η = V2 × 2/(L2 (b 2+ hj2+ h 2)).

In some embodiments, the first stator yoke 2 of the first stator punching unit at the head end is provided with a first protrusion 11 protruding towards the first stator yoke 2 of the last stator punching, the first stator yoke 2 of the last stator punching unit at the tail end is provided with a first groove 12 towards the direction away from the first stator yoke 2 of the first stator punching, and the first protrusion 11 can be inserted into the first groove 12 to form a snap connection.

The utility model discloses a straight strip formula stator core both sides overlap mouth department and be equipped with assorted circular arc arch and circular arc recess respectively, can effectively avoid the phenomenon that takes place the fracture after straight strip formula stator core becomes the circle (current structure is not protruding and recess complex structure, and the breach is a straight line, and the welding atress is easy to split, the utility model discloses a arch and recess cooperation can form the skew angle at the punching press in-process, so the breach is not the straight line, so be difficult for splitting), guarantee stator core's the precision of becoming a circle. (the lap of the utility model refers to the split between the head and the tail yoke parts after the straight bar type stator iron core becomes round).

In some embodiments, the first protrusion 11 is an arc protrusion, the first groove 12 is an arc groove, the width of the arc protrusion in a direction perpendicular to the first end surface 21 is b4, the distance between the first end surface 21 and the second end surface 22 of the first stator yoke 2 is a yoke height hj2, the number of the first stator teeth 1 is a stator core teeth number Z1, and the following relationship is satisfied:

b4= (20% to 40%) (hj 2+ h 2)/tan (180 °/Z1). As shown in fig. 4, the lap openings on both sides of the stator core are respectively provided with a circular arc protrusion and a circular arc groove which are matched with each other, and the width of the circular arc protrusion satisfies the relation:

b4= (20% -40%) (hj 2+ h 2)/tan (180 °/Z1), and when the relation is met, the circular arc protrusion and the circular arc groove are tightly combined after the straight bar type stator iron core is rounded, so that the bonding strength is increased, the phenomenon of cracking after the straight bar type stator iron core is rounded can be effectively avoided, and the rounding precision of the stator iron core is increased.

In some embodiments, the second end surface 22 of the first stator yoke 2 of the first stator punching unit at the head end is provided with a second protrusion 13 protruding in a direction away from the first end surface 21, the second end surface 22 of the first stator yoke 2 of the first stator punching unit at the tail end is provided with a third protrusion 14 protruding in a direction away from the first end surface 21, and a surface where the first protrusion 11 meets the first groove 12 is a first meeting surface 15 between the first end surface 21 and a position where the first protrusion 11 meets the first groove 12; a side surface of the second projection 13 is in contact with a side surface of the third projection 14 to form a second abutment surface 16, the second abutment surface 16 and the first abutment surface 15 are located on different surfaces, the second abutment surface 16 is located closer to the first stator tooth 1 at the head end than the first abutment surface 15, the second projection 13 is a pointed projection, and the third projection 14 is a projection formed smoothly on the second end surface 22; the first process groove 7 is located radially inward of the first abutment surface 15.

Stator core becomes the circle after, there is convex structure outside the lap, this is favorable to welding process, and welding process only one step, high production efficiency, the partial yoke portion of the protruding top of circular arc is towards the bellied opposite direction skew of circular arc, the partial yoke portion of circular arc recess top is towards the notch scheme skew of circular arc recess, two skew angles are unanimous, the yoke portion of circular arc recess top has the outer convex structure of lap after the skew, the yoke portion design closed angle of the protruding top of circular arc is protruding, make this partial yoke portion also have the outer convex structure of lap, two convex structure highly uniform, through forming the skew angle, can make the breach be not the straight line in the manufacturing process, so be difficult for splitting, stator core's preparation stability can be guaranteed.

In some embodiments, the first contact surface 15 and the second contact surface 16 both pass through the center of the annular stator lamination structure, and a center included angle formed by the two is a; the height of the second protrusion 13 is the same as the height of the third protrusion 14, and is h3, and

h3= 0.2-0.5 mm = R/cos (a +180 °/Z1) -R/cos (180 °/Z1), where R is the distance between the second end face 22 and the center of the circle, i.e., the radius of the stator. The utility model discloses a two parts yoke portion all has the evagination structure of taking a mouthful, and two salient structure highly uniform take a mouthful evagination structure to be favorable to welding process.

In some embodiments, the first stator tooth 1 includes a stator tooth body 17 and pole shoes 18, one end of each pole shoe 18 is connected to a circumferential side of the stator tooth body 17 and is farthest away from the first stator yoke 2, and the other end of each pole shoe 18 extends in a circumferential direction, and two pole shoes 18 are provided and are arranged in one-to-one correspondence with two circumferential sides of the stator tooth body 17;

the stator tooth is characterized in that a first buckling point 191 is convexly arranged on the end face of the stator tooth main body 17, two sides of the first buckling point 191 are respectively provided with a reserved groove 20, the depth of each reserved groove 20 is t2, and a second buckling point 192 is convexly arranged on the end face of the first stator yoke portion 2. The reserved grooves are formed in two sides of the buckling point position of the tooth part of each stator punching sheet, the tooth width size does not exceed the tolerance range after the buckling point is punched, the product yield is improved (the buckling point is a structure formed by mutually buckling and pressing the punching sheets, positioning and connection between the punching sheets are realized, and a stator core is assembled) when the buckling point is punched, materials beside the punching sheet can be extruded, the size is increased, the tooth width is an important size, and the reserved grooves need to be cut.

In some embodiments, the stator tooth body has a circumferential width bt and satisfies the relationship: t2= (1% -2%) btt/2. The reserved grooves are formed in two sides of the buckling point position of the tooth part of the stator punching sheet, the depth of each reserved groove meets the relation, and the tooth width size does not exceed the tolerance range after the buckling point is punched, so that a follow-up framework can be smoothly sleeved on the stator core.

In some embodiments, after forming the annular stator lamination structure, the first stator tooth 1 is located at the radial inner side of the first stator yoke portion 2, that is, the stator core for the inner rotor motor. Stator core tooth portion is inboard at yoke portion, and rotor motor is with stator core promptly, and straight strip formula stator core becomes the circle after, guarantees that the notch width can not be too big, improves the performance of motor.

The utility model also provides a stator, it includes preceding arbitrary straight strip stator towards the piece.

The utility model discloses a beneficial effect of stator as follows:

1. the outer surface of the yoke part of each straight strip type stator punching sheet is a straight surface, and during sample arrangement, no overlap edge needs to be reserved between each group of stator punching sheets, so that the material utilization rate is improved, and the stator cost is reduced;

2. the inner diameter surface of the straight strip type stator punching sheet and the inner surface of the yoke part can be attached to perform stock layout, and no overlap is required to be reserved between two rows of stator punching sheets, so that the material utilization rate is improved, and the stator cost is reduced;

3. a process groove is formed in the joint of the inner diameter surface of the stator punching sheet and the yoke part, so that engine oil can better permeate into punching sheet materials in the punching process, and damage to a cutter and the punching sheet is prevented; the process groove can prevent slender excess materials from being left at the rear corner of the punched stator punching sheet, and secondary processing is avoided; the process groove also has a weakening effect on the cogging torque and the torque ripple of the motor;

4. the matched arc bulges and arc grooves are respectively arranged at the lap openings at the two sides of the straight bar type stator core, so that the cracking phenomenon of the straight bar type stator core after the rounding can be effectively avoided (the matching of the bulges and the grooves of the utility model can form an offset angle in the stamping process, so that the cracks are not straight lines, and are not easy to crack), and the rounding precision of the stator core is ensured;

5. after the stator core is rounded, a convex structure is arranged outside the lap opening, which is beneficial to the welding process, and the welding process is only one step, so that the production efficiency is high;

6. and reserved grooves are formed in two sides of the buckling point position of the tooth part of the stator punching sheet, so that the tooth width size does not exceed the tolerance range after the buckling point is punched, and the product percent of pass is improved.

7. Stator core tooth portion is inboard at yoke portion, and rotor motor is with stator core promptly, and straight strip formula stator core becomes the circle after, guarantees that the notch width can not be too big, improves the performance of motor.

The utility model also provides a motor, it includes aforementioned stator.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not intended to limit the present invention, and any modifications, equivalents, improvements, etc. made within the spirit and principles of the present invention should be included within the scope of the present invention. The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.

Claims (19)

1. The utility model provides a straight strip formula stator punching sheet which characterized in that: the method comprises the following steps:

the straight strip type stator punching sheet is subjected to layout manufacturing in the layout manufacturing process to simultaneously manufacture a plurality of stator punching sheet units, the structures of the plurality of stator punching sheet units are the same, and the plurality of stator punching sheet units comprise a first stator punching sheet unit (101) and a second stator punching sheet unit (102);

the first stator punching unit (101) comprises a first stator tooth (1) and a first stator yoke portion (2), one end of the first stator tooth (1) is connected to the first stator yoke portion (2), the other end of the first stator tooth extends towards the direction deviating from the second stator punching unit (102), the second stator punching unit (102) comprises a second stator tooth (3) and a second stator yoke portion (4), one end of the second stator tooth (3) is connected to the second stator yoke portion (4), the other end of the second stator tooth extends towards the direction deviating from the first stator punching unit (101), and the first stator yoke portion (2) is connected with the second stator yoke portion (4);

the end face, provided with the first stator teeth (1), of the first stator yoke (2) is a first end face (21), and the end face opposite to the first stator teeth (1) is a second end face (22); the end face, provided with the second stator teeth (3), of the second stator yoke (4) is a third end face (41), and the end face opposite to the second stator teeth (3) is a fourth end face (42); the second end face (22) is matched with the fourth end face (42) and is mutually attached;

the number of the first stator punching units (101) is multiple, the first stator punching units are sequentially connected to form the straight bar type stator punching, and the first stator punching unit at the head end is connected with the first stator punching unit at the tail end to form an annular stator punching structure;

the first stator yoke (2) is provided with a yoke inner surface boss (8) on the first end surface (21) in a protruding manner, and the height of the yoke inner surface boss (8) from the first end surface (21) is a yoke inner surface boss height h2;

the joint of the inner surface bosses (8) of the yoke parts of two adjacent first stator yoke parts (2) is provided with a connecting groove (9), and the groove top of the connecting groove (9) is also provided with a sinking groove to form a first process groove (7).

2. The straight bar stator punching sheet of claim 1, characterized in that:

the stator punching device is characterized by further comprising a third stator punching unit (103), wherein the third stator punching unit (103), the first stator punching unit (101) and the second stator punching unit (102) are sequentially connected;

the third stator punching unit (103) comprises a third stator tooth (5) and a third stator yoke (6), one end of the third stator tooth (5) is connected to the third stator yoke (6), the other end of the third stator tooth extends towards the first stator yoke (2) and is connected with the first stator yoke (2); the first stator tooth (1) extends towards the direction of the third stator yoke (6) and is connected with the third stator yoke (6);

the end face, provided with the third stator teeth (5), of the third stator yoke (6) is a fifth end face (61), and the end face opposite to the third stator teeth (5) is a sixth end face (62); the free end face of the first stator tooth (1) is matched with the fifth end face (61) and attached to the fifth end face, and the free end face of the third stator tooth (5) is matched with the first end face (21) and attached to the first end face.

3. The straight bar stator lamination of claim 2, wherein:

the number of the second stator punching units (102) is multiple, and the second stator punching units are sequentially connected; the number of the third stator punching units (103) is multiple, and the third stator punching units are sequentially connected; the first stator teeth (1) are inserted between two adjacent third stator teeth (5), and the third stator teeth (5) are inserted between two adjacent first stator teeth (1) to form a plug-in and sample-out structure.

4. The straight bar stator lamination of claim 2, wherein:

the end face of the free end of the first stator tooth (1) is a first cambered surface, the fifth end face (61) of the third stator yoke (6) is a second cambered surface, and the first cambered surface is attached to the second cambered surface; the free end face of the third stator tooth (5) is a third cambered surface, the first end face (21) of the first stator yoke portion (2) is a fourth cambered surface, and the third cambered surface is attached to the fourth cambered surface.

5. The straight bar type stator punching sheet of claim 4, characterized in that:

the first cambered surface is a concave cambered surface, and the second cambered surface is a convex cambered surface; the third cambered surface is a concave cambered surface, and the fourth cambered surface is a convex cambered surface.

6. The straight bar stator punching sheet of claim 1, characterized in that:

the second end face (22) of the first stator yoke portion (2) is a straight plane and the fourth end face (42) of the second stator yoke portion (4) is a straight plane during stock layout manufacturing.

7. The straight bar stator punching sheet of claim 1, characterized in that:

the connecting groove (9) is opposite to the second end face (22) and the minimum distance between the connecting groove and the second end face (22) is a yoke connecting height h1; the width of the first process groove (7) is b3, the distance between the connection position of the first end surface (21) and the inner surface boss (8) of the yoke part and the second end surface (22) is a yoke part height hj2, the tooth number of the first stator tooth (1) is a stator core tooth number Z1, and the parameters satisfy the following relational expression: b3=2 × (hj 2-h1+ h 2) × tan (180 °/Z1) + (0.2 to 0.5) mm.

8. The straight bar type stator punching sheet of claim 1, characterized in that:

a second process groove (10) is formed in the free end face of the first stator tooth (1), and the depth t1 of the second process groove (10) is = 0.2-0.3 mm; and a process chamfer is arranged at the joint position of the first end surface and the boss (8) on the inner surface of the yoke part, and h2 is larger than the radius of the process chamfer.

9. The straight bar type stator punching sheet of claim 7, characterized in that:

the tooth pitch between two adjacent first stator punching units (101) is L3, and L3 is the distance between the central line of two adjacent first stator teeth (1), along radial direction in the annular stator punching structure, the distance between second terminal surface (22) and the centre of a circle is stator radius R, the number of teeth of first stator teeth (1) is stator core number of teeth Z1, and above-mentioned parameter satisfies following relational expression:

L3＝2*(R-h1)*tan(180°/Z1)。

10. the straight bar type stator punching sheet of claim 9, characterized in that:

the stock layout width of straight strip type stator punching is L2, and L2 is a plurality of first stator punching unit (101) connects gradually's length, the number of teeth of first stator tooth (1) is stator core number of teeth Z1, and the tooth pitch between two adjacent first stator punching unit (101) is L3, and L3 is the distance between the central line of two adjacent first stator teeth (1), and above-mentioned parameter satisfies the following relational expression:

L2＝(Z1+0.5)*L3+(6～9mm)。

11. the straight bar stator punching sheet of claim 1, characterized in that:

the first stator yoke portion (2) of the first stator punching unit of the head end faces the direction protrusion of the first stator yoke portion (2) of the tail end first stator punching sheet, a first protrusion (11) is arranged on the first stator yoke portion (2) of the tail end first stator punching unit, the first stator yoke portion (2) of the tail end first stator punching sheet faces the direction deviating from the first stator yoke portion (2) of the first stator punching sheet of the head end, a first groove (12) is formed in the direction, and the first protrusion (11) can be inserted into the first groove (12) to form a clamping connection.

12. The straight bar stator punching sheet of claim 11, characterized in that:

first arch (11) are the circular arc arch, first recess (12) are the circular arc recess, the circular arc is protruding along the perpendicular to the width of the direction of first terminal surface (21) is b4, first stator yoke portion (2) first terminal surface (21) extremely distance between second terminal surface (22) is yoke portion height hj2, the number of teeth of first stator tooth (1) is stator core number of teeth Z1, and the following relational expression is satisfied to above-mentioned parameter: b4= (20% -40%) (hj 2+ h 2)/tan (180 °/Z1).

13. The straight bar stator lamination of claim 11, wherein:

a second protrusion (13) is convexly arranged on the second end face (22) of the first stator yoke (2) of the first stator punching unit at the head end in the direction away from the first end face (21), a third protrusion (14) is convexly arranged on the second end face (22) of the first stator yoke (2) of the first stator punching unit at the tail end in the direction away from the first end face (21), a position where the first protrusion (11) is connected with the first groove (12) is arranged between the first end face (21), and the opposite and connected faces of the two first stator yokes (2) are first connection faces (15); a side surface of the second protrusion (13) is in contact with a side surface of the third protrusion (14) to form a second abutment surface (16), the second abutment surface (16) is located on a different surface from the first abutment surface (15), the second abutment surface (16) is located closer to the first stator tooth (1) at the head end with respect to the first abutment surface (15), the second protrusion (13) is a pointed protrusion, and the third protrusion (14) is a protrusion smoothly formed by being formed on the second end surface (22); the first process groove (7) is located radially inward of the first abutment surface (15).

14. The straight bar stator punching sheet of claim 13, characterized in that:

the first connecting surface (15) and the second connecting surface (16) respectively pass through the circle centers of the annular stator punching sheet structures, and the included angle between the circle centers is a; the protruding height of the second protrusion (13) is the same as that of the third protrusion (14), and is h3, and

h3= 0.2-0.5 mm = R/cos (a +180 °/Z1) -R/cos (180 °/Z1), wherein R is the distance between the second end face (22) and the center of the circle, namely the radius of the stator.

15. The straight bar type stator punching sheet of claim 1, characterized in that:

the first stator tooth (1) comprises a stator tooth main body (17) and two pole shoes (18), one end of each pole shoe (18) is connected to the circumferential side face of the stator tooth main body (17) and is farthest away from the first stator yoke part (2), the other end of each pole shoe extends towards the circumferential direction, and the two pole shoes (18) are arranged on two circumferential sides of the stator tooth main body (17) in a one-to-one correspondence mode;

the protruding first knot point (191) that is provided with on the terminal surface of stator tooth main part (17), the both sides of first knot point (191) all are provided with preformed groove (20), the degree of depth of preformed groove (20) is t2, the protruding second knot point (192) that is provided with on the terminal surface of first stator yoke portion (2).

16. The straight bar stator lamination of claim 15, wherein:

the circumferential width of the stator tooth main body is tooth width bt and satisfies the relation: t2= (1% -2%) btt/2.

17. The straight bar type stator punching sheet of claim 1, characterized in that:

after forming annular stator lamination structure, first stator tooth (1) is located the radial inboard of first stator yoke portion (2), stator core for the inner rotor motor promptly.

18. A stator, characterized by: comprising a straight strip stator lamination according to any one of claims 1 to 17.

19. An electric machine characterized by: comprising the stator of claim 18.

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